p62 manipulation affects chlorin e6-mediated photodynamic therapy efficacy in colorectal cancer cell lines.

p62 is a multifunctional protein that mediates cell signaling pathways, autophagy and tumorigenesis, and participates in important regulation processes at the intersection between autophagy and cancer. Photodynamic therapy (PDT) is a treatment that involves photosensitizing agents and light to kill cancer cells. However, whether the efficacy of PDT depends on the expression level of p62 in colorectal cancer cell lines is not known. The present study aimed to examine the role of p62 expression levels in chlorin e6-based PDT in colorectal cancer cells. To study the effect of p62 on cancer cell death, we used PDT to treat a stable cell line overexpressing p62. Cells overexpressing p62 showed a higher cell death rate than cells not expressing this protein. Overexpression of p62 may contribute to colorectal cancer cell death. These results provide preliminary evidence for use of p62 as a therapy target to treat colorectal cancer.